statisticsthe subway train has 18 doors and starts with 15 passenger. if each passenger is equally likely to get off at any station and the passengers leave the train independently, find the probability that 2 or more passengers leave the train through the same door
April 13, 2014

MAT 116how do I write the expression and then solve it four square dived by two square?
May 14, 2012

mathIf the store purchases an item at a wholesale cost of $3.50 per item, and it is sold at a retail value of $5.00 per item. What is the gross profit percentage of the item? (formula: gross profit percentage = [(retail - cost) divided by retail] X 100 )
September 18, 2011

chemistryHow many grams of each substance are needed to prepare th e following solutions? 50.0 ml of 8.0%(w/v)KCL
January 26, 2011

statisticroll 2 standard dice and add the numbers. what is the probability of getting a number larger than 9 for the first time on the third roll?
January 15, 2011

Physics - urgentOh okay, thank you, now I get the correct answer for c, but b is still not working out, could you please help me with that?
April 21, 2009

Physics - urgent - due tomorrowplease, I honestly keep trying to look at the problem from different points of view, but nothing is working out; I'm running out of ideas as to how I can approach and still, I'm not getting the right answer or understanding drwls' answers...
April 21, 2009

Physics - urgentI already asked this and was given an answer, but I don't fully understand it and so would like a further explanation. What I asked was... An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel ...
April 21, 2009

Physics - importantAn electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to the electric field. a) Calculate the work done on the electron by the field when the electron has travelled 2.5 cm in the field. b) Calculate...
April 21, 2009

PhysicsAn electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to the electric field. a) Calculate the work done on the electron by the field when the electron has travelled 2.5 cm in the field. b) Calculate...
April 21, 2009

PhysicsParticle A has a mass of 2 and a charge of -1. Particle B has a mass of 2 and a charge of +1. Are particle A and B necessarily antiparticles? Explain your answer.
April 13, 2009

PhysicsParticle A has a mass of 2 and a charge of -1. Particle B has a mass of 2 and a charge of +1. Are particle A and B necessarily antiparticles? Explain your answer. I don't think so, but I'm not sure how I can explain why.
April 8, 2009

physicsWhat particles are made with two quarks, and what restrictions are there on the two quarks in it? I'm pretty sure it's mesons, but I don't know the restrictions. What particles are made with three quarks and what restrictions is there on the three quarks? Again, I ...
April 7, 2009

physicscalculate the escape velocity for the following; assume a launch from the surface. A space probe leaving the moon to come back to Earth. A moon mission lander leaving the moon to come back to Earth. A spaceship leaving the solar system.
March 27, 2009

physicsAlso, I think I've found the first velocity, but would I disregard that when finding the velocity at point B?
March 12, 2009

physicsI tried doing that; can you please explain. Wait, so, would the first velocity be mgh=1/2mv^2 and then I take away the m's?
March 12, 2009

physicsI have a diagram of a roller coaster. It starts at a height of 100m where the v=0, it then drops completely to the ground and then goes into a loop that is 75m high; the point where the loop starts is point A. From the loop, the track raises to e height of 50m (this is point B...
March 12, 2009

Jewelry markingsI have purchased a thrift item...a bronze or brass, styalilzed, shaped bracelet, marked with an anchor with the letters S C on either side of the anchor shank. There is not ring on the top of the anchor. There are hooks on the tips of the anchor.
December 17, 2006

Jewelry markingsI have purchased a thrift item...a bronze or brass, styalilzed, shaped bracelet, marked with an anchor with the letters S C on either of the anchor shank. There is not ring on the top of the anchor. There are hooks on the tips of the anchor.
December 17, 2006